in the current version only the pink candy has implemented events. If you give it to imouto while suggesting to drink milk from the vending machine, it will act as a powerful a aphrodisiac and she will have to go deal with it in the toilet prompting a peeking scene.
Corgrarm
Recent community posts
the red message about higher game engine means that there is a more recent version of the client and the game will ask you if you want to update or not.
If you update, the client will then detect that your previous save is from a different version which will display the "timeline" warning, but saves are compatible between 0.66 versions so you don't really have to worry about it for the auto updates.
However, i'm surprised that you say you have this happening every day. Let's say you install 0.66C, then you should get auto update to latest compatible version followed by the "timeline" warning when game then restart after update and you load an existing save.
After that point it shouldn't make a new auto update request unless a new version has been released and if you save the game i'm pretty sure the new save should be flagged as the new version so you shouldn't get this message when loading it. If you load a save made before the auto update then it is likely normal if the warning appears.